Hi. Thanks for your query and an elucidate history. Your history is so clear. It looks that you have a serious problem with your lower spinal column. There may be kyphoscoliosis which is giving you a chance to touch your spine through abdomen. This is the reason to have foot drop, left leg numbness, burning pain in back, fibromyalgia and pain in abdomen. What you need is as follows:: MRI study of the whole spine. This will the perfect diagnosis, and an evaluation by a Neurologist for nerve conduction studies, and Neuro-Surgeon to see the possibility of surgical correction so that your problems can be reduced or solved ...